Fatal error: Uncaught Facebook\Exceptions\FacebookSDKException: Required "app_id" key not supplied in config and could not find fallback environment variable "FACEBOOK_APP_ID" in /home/users/2/flatworld/web/seo.flatworld.jp/core/library/facebook/Facebook.php:139 Stack trace: #0 /home/users/2/flatworld/web/seo.flatworld.jp/core/controllers/facebook.php(38): Facebook\Facebook->__construct(Array) #1 /home/users/2/flatworld/web/seo.flatworld.jp/core/app.php(158): require('/home/users/2/f...') #2 /home/users/2/flatworld/web/seo.flatworld.jp/index.php(25): require('/home/users/2/f...') #3 {main} thrown in /home/users/2/flatworld/web/seo.flatworld.jp/core/library/facebook/Facebook.php on line 139